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Genetics: Heredity

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Term
Definition
Heredity   The passing of traits from parents to their offspring.  
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Genetics   The study of heredity.  
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Allele   An alternative form of a gene.  
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Punnett Square   A diagram used to predict the outcome of a genetic cross.  
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Gene   A segment of DNA that controls a trait.  
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Dominant allele   The allele that is expressed in an organism.  
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Recessive allele   The allele that is hidden by the dominant gene or not expressed.  
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Genotype   An organism's combination of genes for a trait.  
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Phenotype   An organism's physical appearance or characteristics as a result of its combination of genes.  
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Law of Independent Assortment   The pairs of genes separate independently of one another.  
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Law of Segregation   The pair of alleles for a trait will separate when gametes are formed; so that each gamete will have a random allele.  
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Homozygous   An individual that has two alleles that are the same for a particular trait.  
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Heterozygous   An individual that has two alleles that are different for a particular trait.  
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